Installing Microsoft Office 2010 using the preinstalled "out of the box" function, I got this error:
Error 1913: Setup cannot update file C:\windows\win.ini
Permissions were right. I could rename the file, so that means it was not in use by some other program... but apparently it was Trend Micro blocking the installation.
Using services.msc I disabled all Trend Micro stuff, finished the install and rebooted to get all services running as normal.
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